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D. BRUCE.

Vacuum Pan.

Patented Jain. 22, 1867.

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DUNCAN BRUCE, OF ROSSVILLE, NEW YORK. Letters Patent No. 61,314, datedJanuary 22, 1867; dntedtted January 11411867.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, DUNCAN BRUCE, of Rossvillc, in the county ofRichmond, and State of New York, have invented a new and improvedApparatus for Making Sugar; and'I do hereby declare that the followingis a full, clear, and exact description thereof, reference being bad tothe accompanying drawings, making a part of this specification, inwhich- Figure 1 is a top view of the improved apparatus.

Figure 2 is a sectional elevation of the apparatus.

Similar letters of reference indicate corresponding parts in the twofigures.

This invention relates to a new and improved apparatus forfacilitatingthe evaporation of saccharinejuice in the process of making sugar. Thenature of my invention consists in the employment of a number ofairtight evaporating vessels having heaters suitablyapplied to thein,and in-combining therewith a condensingchamber, and also avacuum-chamber, between which communications are formed in such mannerthat during. the treatment of the juice the air can be exhausted fromits chambers, and its evaporation thereby greatly accelerated; at thesame time provision is made for drawing the juice from one vessel intoanother by means of a vacuum created in the vacuum-chamber for thepurpose of filtering and purifying-this juice previously to boiling it,all as will be hereinafter set forth.

To enable others skilled in the art to understand my invention, I willdescribe its construction and operation. 7

In the accompanying drawings, A is the reservoir for containing thejuice in its crude state, from which reservoir the juice is drawn intothe vacuum or evaporating vessel B; this vessel contains a worm or coil,0:, through which steam' is caused to circulate, and it communicateswith the first filtering vessel 0 by means of a pipe, 6, which isfurnishod with a stop-cock that should be closed, except when the sirupis being transferred to the vessel 0. This vacuum vessel B alsocommunicates, by means of a pipe, 0, with a pipe, leading to thecondenser D. The cock in the short pipe of vessel B is opened only whenair is to be drawn from this vessel, at which time the other cocks areclosed. This condensing vessel D communicates with the vacuum-chamber Eby means of a pipe, d, which is connected to the worm d in said vessel;this worm is connected at its upper end with the long pipe S leadinginto D. The vessel E has a suitable exhausting engine, J, applied to it.The vapor which is generated in the several evaporators isdrawn rapidlyofi and into the worm a in D, where this vapor is quickly condensed bymeans ofwater which is caused to circulate freely in the condenser. Thesteam or hot-water worm a in the evaporator B communicates with pipesleading to and from a steam boiler. The vessel G contains a steam wormheater, or a false bottom through which hot water or steam is caused toflow, and the sirup is elevated into this vessel from vessel 13 bymeansof a-vacuum, the air being drawn oil through a pipe, g, leading to themain pipe S, as shown in fig. 2, and also through the worm a in thecondenser D; From the vessel C,, the sirup is drawn into a filteringvessel, F, by means of a pipe which leads to the bottom of this vesselbeneath asuitable filtering medium placed therein. In the vessel F thereis a steam or hot-water heater communicating with a similar heater inthe vessel C, and also with one in G, into which latter the sirup isdrawn from F by its natural flow. lathe-vessel G the sirup flowsabovc afiltering substance placed therein, and passes down through it as it isdrawn oil into the boiler H. Thisboiler H communicates with thecondenserD, and also with the vacurim-chamber E by means of the pipe S, so that.during the process'oi' boiling in the vessel H a vacuum can be formedtherein, and the vapor exhausted and condensed in D. The vessel Hisprovided ,with a steam worm which may communicate with the worms in theseveral chambers above described. The pipe d, which forms thecommunication between the vacuum-chamber E and the condenser 1), shouldcommunicate with a vessel'placed lower than the vessel 1) for receivingthe condensed liquid, so that this liquid shall not be drawn into thevacuum-chamber.

The apparatus herein described may be employed upon a more extendedscale forevaporating brine in the process of making salt.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is 1. The combination of the vacuum-chamber,and condensing-chamber, with one or more evaporatingchambers havingsteam or hot-water hea'ters applied to them, substantially as described.i

2. The combination of oneor more filtering air-tight vessels, with oneor more air-tight evap'orators, and a condensing-chamber D, whichcommunicates with a vacuum-chamber E, substantially as described.

' DUNCAN BRUCE. Witnesses:

R. T. CAMPBELL, Enw. Sounrnn.

